Because of a concussion he suffered Monday in practice, Dallas Mavericks center Chris Kaman might miss all four games on his team's current four-game road trip.

Kaman is out indefinitely after he fell on the floor and banged his head during Monday's practice at American Airlines Center. He also has to pass the NBA's stringent rules in regards to concussions before he can return to the court.

"He'll be back when his symptoms abate and we don't know a timetable for it," coach Rick Carlisle said. "I don't think it's that serious, but these things, you've got to be very careful with.